P0014 on 2020-2021 Buick Encore GX 1.3L: Exhaust Cam Timing Over-Advanced Causes and Fixes

What's Unique About the 2020-2021 Buick Encore GX

The 1.3L L3T engine in the 2020-2021 Encore GX and its platform-mate, the 2021 Chevrolet Trailblazer, has a specific known issue documented by General Motors. TSB #A202304840 (also listed as 20-NA-120) notes that the camshaft actuator oil control valve (OCV) center bolt can stick or bind, directly causing a P0014 code, rough running, and reduced power. This makes it a critical platform-specific issue to consider after checking the more common causes like oil level and the actuator solenoid itself. A real-world owner of a 2021 Trailblazer confirmed this exact failure mode, where a dealer repair following the TSB fixed the issue after a solenoid replacement did not.

Symptoms You May Notice

• Check Engine Light is on
• Rough or unstable idle
• Reduced engine power and sluggish acceleration
• Decreased fuel economy
• Engine may be hard to start
• Engine stalling
• Engine shudder or surging

Most Likely Causes

1. Low, Dirty, or Incorrect Viscosity Engine Oil 🔴 High Probability The VVT system is hydraulic and extremely sensitive to oil pressure, volume, and cleanliness. Sludge or low levels can prevent the cam phasers from operating correctly.
   How to confirm: Check the oil level on the dipstick and inspect its color and consistency. If it's low, black, or sludgy, it needs to be changed. This is always the first step.
   Typical fix: Perform an oil and filter change using a full synthetic oil that meets GM's dexos1 specification.
   Est. part cost: $40-$80
2. Faulty Exhaust Camshaft Position Actuator Solenoid 🔴 High Probability This solenoid is a small, electrically-controlled valve that can get clogged with debris from dirty oil or fail electronically over time. It's a very common failure point on modern VVT systems across all manufacturers.
   How to confirm: Swap the identical intake and exhaust solenoids. Clear the codes and drive. If the code changes to P0011 (Intake Camshaft Position Timing Over-Advanced), the original exhaust solenoid is confirmed faulty. You can also test the solenoid's resistance with a multimeter; it should be between 5-12 Ohms. 🎬 See how to test VVT solenoids with a multimeter
   Typical fix: Replace the exhaust camshaft position actuator solenoid. It is held in by a single bolt and is easily accessible on top of the engine.
   Est. part cost: $25-$80
3. Binding Camshaft Actuator Oil Control Valve (OCV) Bolt 🟡 Medium Probability This is a specific, documented issue for 2020-2021 Encore GX and 2021 Trailblazer models with the 1.3L engine, as noted in GM TSB #A202304840 / 20-NA-120. The center bolt within the actuator can stick, preventing proper cam phasing.
   How to confirm: This is difficult to confirm without following the TSB procedure. It is typically diagnosed after ruling out oil issues and a faulty solenoid. A GM dealer will be familiar with this TSB. A Trailblazer owner reported this exact scenario, where the dealer performed the TSB repair to fix the problem.
   Typical fix: The fix, per the TSB, involves a specific diagnostic procedure to confirm the fault, followed by replacing the camshaft position actuator solenoid bolts if P0011 is present, or other steps if only P0014 is present. This is best performed by a dealer.
   Est. part cost: $10-$30

Rare But Worth Checking

• Stretched Timing Chain or Failed Cam Phaser: This is a more serious mechanical issue. It's less common than sensor or oil problems but can occur, especially on higher-mileage vehicles. It would likely be accompanied by rattling noises from the engine.
• Damaged Wiring or Connector: Inspect the wiring harness going to the exhaust camshaft actuator solenoid for any signs of fraying, melting, or corrosion on the connector pins.
• Debris in Camshaft Actuators: GM TSB PIP6082 notes that debris can accumulate in the camshaft actuators, leading to performance issues and setting fault codes like P0014. This often results from poor oil quality or extended oil change intervals.

Diagnosis Steps

1. Check Engine Oil: Verify the oil level is full and the oil is clean. If it's low or past its change interval, perform an oil and filter change with the correct dexos-approved oil. Clear the code and see if it returns.
2. Inspect Wiring: Check the electrical connector and wiring going to the exhaust camshaft actuator solenoid (the 'B' or exhaust side) for any damage or loose connections.
3. Perform Solenoid Swap Test: The intake and exhaust actuator solenoids are identical and easily accessible. Unplug both, unbolt them (typically a 10mm bolt), 🎬 Watch this quick DIY guide to confirm a faulty solenoid and swap their positions. Reinstall and clear the codes.
4. Re-evaluate Codes: Drive the vehicle. If the trouble code changes to P0011 (Intake Camshaft Position Timing Over-Advanced), you have confirmed the solenoid is faulty.
5. Replace the Faulty Solenoid: If the swap test confirmed a bad solenoid, purchase a new one and install it in the exhaust position.
6. Investigate TSBs: If the P0014 code returns after the swap, the issue is not the solenoid. At this point, the binding actuator bolt mentioned in TSB A202304840 becomes the most likely suspect for this specific vehicle and year range. The TSB outlines a specific dealer procedure involving running the engine at high RPM to heat the oil and then checking for codes. This is best left to a qualified technician.
7. Advanced Diagnostics: If all else fails, a technician would need to check for a clogged cam phaser, stretched timing chain, or other internal engine issues.

Parts You'll Likely Need

• Exhaust Camshaft Position Actuator Solenoid (OEM #12694738) — This is the most common part to fail, causing the P0014 code. It gets stuck or clogged, preventing proper oil flow to the cam phaser. The intake and exhaust solenoids are identical.
  Trusted brands: ACDelco, GM Genuine
  OEM price range: $50-$90
  Aftermarket price range: $25-$60
• Engine Oil and Filter — Low or dirty oil is a primary cause of VVT system faults. An oil change is a critical first step and may resolve the issue on its own.
  Trusted brands: Mobil 1, Castrol, Valvoline (dexos-approved)
  Aftermarket price range: $40-$80

Related Codes That Often Appear With This One

• P0011 — This is the corresponding code for the intake camshaft. If you swap a bad exhaust solenoid to the intake side for diagnosis, this code will appear. If both appear together initially, it points to a systemic issue like severe oil sludge, low oil pressure, or the specific TSB A202304840 issue.
• P0013 — This is an electrical circuit code for the same exhaust solenoid. Seeing P0013 and P0014 together almost guarantees the solenoid or its wiring is the problem.

Technical Service Bulletins (TSBs) & Recalls

• A202304840 / 20-NA-120: Camshaft actuator oil control valve (OCV) center bolt may stick or bind, causing rough running, reduced power, and DTCs P0011 or P0014. The dealer procedure involves a specific test running the engine to high temperatures to verify the fault.
• PIP6082: Engine surge or misfire with DTC P0011 (or P0014) can be caused by debris in the camshaft actuators.

Platform-Specific Known Issues

• TSB A202304840 / 20-NA-120: For 2020-2021 models with the 1.3L L3T engine, GM issued a bulletin regarding the camshaft actuator oil control valve (OCV) center bolt sticking or binding, which directly causes P0014 or P0011.
• TSB PIP6082: Notes that debris can accumulate in the camshaft actuators, leading to performance issues and setting fault codes.
• Intercooler Icing in Cold Weather: A GM TechLink article notes that in temperatures below 0°F (-18°C), the intercooler on the 1.3L L3T can ice over, restricting airflow and causing power loss or hesitation, which could potentially be misdiagnosed.

Mechanic-Grade Diagnostic Values

• Camshaft Position Actuator Solenoid Resistance — expected: 5-12 Ohms. Failure: A reading of 0 Ohms (short), OL/infinite Ohms (open), or a value significantly outside the expected range indicates a faulty solenoid coil.
• Scan Tool Live Data: Desired vs. Actual Exhaust Cam Angle — expected: The 'Actual' angle should track the 'Desired' angle commanded by the ECM within +/- 2-3 degrees under stable operation.. Failure: With P0014, the 'Actual' angle will be persistently greater (more advanced) than the 'Desired' angle by more than 5-10 degrees for a specified time.
• VVT Solenoid Connector Voltage (Key On, Engine Off) — expected: Battery voltage (approx. 12V) should be present on one of the two pins.. Failure: No voltage suggests a problem with the power supply circuit, a blown fuse, or an issue in the ECM circuit, not necessarily the solenoid itself.

Hidden / Shadow Codes Worth Checking

• Symptom Byte (e.g., 0x5A, 0x02): GM vehicles often store a 2-digit hexadecimal 'symptom byte' along with the main DTC. For a performance code like P0014, this can provide more context. For example, 0x5A can mean 'Signal Invalid' and 0x02 can mean 'Signal Above Allowable Range,' pointing towards a performance deviation rather than a pure electrical fault. (see via A professional scan tool like the GM GDS2 (Global Diagnostic System 2) is required to view symptom bytes.)

Scan Tool Commands That Help

• GM GDS2: Camshaft Position Actuator Control — This is a bidirectional test found under 'Engine Control Module -> Control Functions'. It allows a technician to command the exhaust VVT solenoid to a specific duty cycle (e.g., 0%, 10%, 25%) while the engine is idling. The technician can then watch the 'Desired' vs 'Actual' cam angle PIDs. If the actual angle does not change when commanded, it confirms a fault in the hydraulic circuit (stuck solenoid, clogged passage, bad phaser).
• GM GDS2: Crankshaft Position Variation Learn — This procedure is not typically needed for a simple solenoid replacement but is required after replacing a camshaft phaser, timing chain, or the ECM itself. It allows the ECM to learn the mechanical tolerances of the new components.

Wiring & Ground Locations

• G103 / G105 — These are common engine block ground points for GM vehicles. Typically located on the side of the engine block or near the transmission bellhousing. A poor ground here can cause erratic behavior from multiple engine sensors and actuators.. The ECM and its network of sensors, including the camshaft position sensor and actuator, rely on a clean ground reference. A corroded or loose G103/G105 ground can introduce electrical noise, potentially causing incorrect readings or actuator behavior that could contribute to a P0014 code.
• Exhaust Camshaft Actuator Solenoid Connector — On top of the engine, plugged into the exhaust VVT solenoid.. This 2-pin connector is the direct electrical interface. One pin is the 12V power supply, and the other is the control (ground-side switched or duty-cycled) from the ECM. Checking for voltage, ground, and pin integrity is a key step if an electrical fault is suspected (e.g., if P0013 is also present).

Real Owner Repair Stories

• Trailblazer.org Forum User (2021 Chevrolet Trailblazer 1.3L) — Check Engine Light with P0011 and P0014, rough running, reduced power.
  ❌ Tried (didn't work) Replaced both VVT solenoids.
  ✅ What actually fixed it The dealer performed the repair outlined in TSB A202304840, which addresses a known issue with the camshaft actuator oil control valve (OCV) bolt sticking. This confirmed the TSB was the root cause, not the more common solenoid failure.
• Reddit user report (paraphrased) (2021 Chevrolet Trailblazer 1.3L) — P0014 code, rough idle, and hesitation.
  ❌ Tried (didn't work) Replaced exhaust VVT solenoid., Dealer performed TSB 20-NA-120 procedure.
  ✅ What actually fixed it The ultimate cause was found to be metal debris from a failing oil pump that had circulated through the engine and clogged the oil passages within the camshaft phaser itself. The final repair required replacing the oil pump, the affected camshaft phaser, and performing a full engine flush to remove contaminants.

When the Usual Fixes Don't Work

• While a faulty VVT solenoid is the most common cause, multiple owner reports for the 2020-2021 1.3L L3T engine confirm that simply replacing the solenoid does not always fix the P0014 code. In these cases, the root cause was often the specific binding actuator bolt addressed in TSB A202304840. This elevates the TSB from a 'rare possibility' to a 'medium probability' cause that should be investigated if a new solenoid doesn't resolve the issue.

OEM Part Supersession History

• 12681273 → 12694738 — Part has been updated by GM for improved reliability or manufacturing process.
  Heads up: The new part number (12694738) is the correct replacement and is fully compatible. Using old stock of the previous number is not recommended.

Model Year Variations Within This Range

• 2020-2021: Models within this range are specifically called out in TSB A202304840 / 20-NA-120 for the sticking camshaft actuator oil control valve (OCV) center bolt. The original part could bind, while a revised part resolves the issue. This makes the TSB a much higher probability cause for these years compared to later models.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Electronic Brake Booster Failure 🔴 High — Affects a significant number of 2020-2021 models, leading to a recall. (Ref: NHTSA Recall ID 20V588 / GM Recall A202307260.)
• Transmission Problems (CVT) 🟠 Medium — Complaints of hesitation, jerking, and premature failure, often reported between 30,000 and 60,000 miles.
• Engine Power Loss / Stalling 🟠 Medium — Numerous owner complaints filed with the NHTSA regarding unexpected loss of power or stalling, separate from the P0014 code.
• Emergency Jack Fracture 🟡 Low — The supplied jack can fracture if not positioned correctly, affecting 2020-2022 models. (Ref: NHTSA Recall / GM Recall A212335470.)
• Intercooler Icing in Extreme Cold 🟡 Low — In temperatures below 0°F (-18°C), the intercooler can ice over, causing temporary power loss after a cold start. (Ref: Documented in a GM TechLink article.)

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used VVT solenoid from a low-mileage (under 50k miles) donor vehicle can be a cost-effective way to perform the 'swap test' for diagnosis. If the used part resolves the code, it confirms the diagnosis before you spend money on a new part. However, due to the relatively low cost of new aftermarket solenoids, many owners opt to buy new from the start.

Donor-vehicle mileage cap: roughly under 50000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• Inspect the solenoid's mesh screens for any tears, sludge, or metallic debris. A clean screen is a good sign.
• Check the electrical connector pins for any signs of corrosion or damage.
• Verify the part number matches the OEM number for your vehicle (12694738).

OEM-only on this vehicle (don't cheap out):

• Camshaft Phaser/Actuator (the gear assembly itself): Aftermarket phasers are known to have high failure rates and can cause persistent timing issues. Always use GM Genuine or ACDelco for this component.
• Camshaft Actuator Oil Control Valve Bolt: If performing the TSB fix, use the specific updated bolt kit from GM to ensure the binding issue is resolved.

Aftermarket brands forum-validated for this vehicle:

• For VVT Solenoids: Delphi, Standard Motor Products (SMP), Walker Products are generally considered reliable alternatives to ACDelco.

Brands owners have reported issues with on this vehicle:

• Unbranded, 'white-box' solenoids from online marketplaces often have inconsistent quality control and may fail prematurely or not perform to OEM specifications.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0011 — This is the intake-side equivalent of P0014 (Intake Camshaft Position Timing Over-Advanced) and is frequently mentioned in TSB A202304840 and PIP6082 alongside P0014.
• P0010 — Related to the intake camshaft actuator circuit; often diagnosed alongside P0014 when troubleshooting the VVT system.
• P0300 — Random or multiple cylinder misfires can occur as a result of the engine surge or timing issues described in TSB PIP6082.

Frequently Asked Questions